Little confused on why this was split

[punkass]

When trying to compare hands...try to see what a hand "adds" to the board. When the board has 3 low cards, you can easily compare players' hands by comparing what low cards they add to the board, since everyone will use the same base 3 cards. So on your board of 567T7, everyone uses a 567 for their low. You added an A4, your opponent added a 23. 23 is better than A4 when deciphering low. Having an A2 to this board would be nut low, so yes, it would win.